Every agent-payable API.

Live gas prices: EIP-1559 base fee plus low/medium/high priority tiers in gwei, and the estimated cost of a simple transfer.

NFT metadata for ERC-721 and ERC-1155 tokens on Base, Polygon, Arbitrum, Optimism and Ethereum. Resolves tokenURI through IPFS, Arweave, data: URIs and public HTTPS, and returns the parsed metadata JSON.

NFT metadata for ERC-721 and ERC-1155 tokens on Base, Polygon, Arbitrum, Optimism and Ethereum. Resolves tokenURI through IPFS, Arweave, data: URIs and public HTTPS, and returns the parsed metadata JSON.

Detect upgradeable proxy patterns (EIP-1967, UUPS, Transparent, Beacon) for any contract and return the current implementation address. Essential before trusting or calling an unknown contract.

ERC-20 token metadata: name, symbol, decimals and total supply for any token contract on Base, Polygon, Arbitrum, Optimism or Ethereum.

Transaction details and receipt by hash: status, block, from, to, value, gas used, effective gas price and decoded ERC-20 transfers.

Transaction details and receipt by hash: status, block, from, to, value, gas used, effective gas price and decoded ERC-20 transfers.

Portfolio of any wallet in one call with total USD: for an EVM address the native coin and major tokens on Base, Ethereum, BSC, Arbitrum, Polygon, Avalanche and Optimism at once; for a Solana address SOL and every SPL token with a market price; Bitcoin and Tron addresses too. Per asset amount and USD, totals per chain. For agents that check a counterparty, a treasury or their own funds before acting.

One address across five EVM chains (Base, Ethereum, Arbitrum, Optimism, Polygon): native coin and USDC balance per chain and total USD value.

Multinomial coefficient (k1+k2+…)! / (k1! k2! …) — the number of ways to partition n = Σki items into labelled groups of the given sizes. The sum must be ≤ 20000.

Multiply two matrices A·B. The inner dimensions must agree (columns of A equal rows of B); a mismatch or a ragged/empty matrix is a clean 400.

Multiverse Speculation — Parallel universe theory for choice, probability, and alternative outcomes exploration.

Munition Exa Answer: x402-paid cited answers for AI agents. Pay 0.01 USDC to get a direct answer to a question grounded in live web search, with the source pages as citations.

Munition Exa Contents: x402-paid page content extraction for AI agents. Pay 0.002 USDC per call to fetch clean text (plus optional highlights and summaries) for up to 20 URLs from Exa's cache, with live crawl fallback.

Munition Exa Find Similar: x402-paid similar-page discovery for AI agents. Pay 0.01 USDC to get up to 25 pages semantically similar to a given URL (competitors, related articles, alternatives), with optional page contents.

Munition Exa Search: x402-paid neural web search for AI agents. Pay 0.01 USDC per query and get up to 25 ranked results (title, url, date, author, optional page text/highlights/summary) from Exa's semantic index. Supports categories (news, research paper, company, github, people…), domain include/exclude and date filters.

Munition Firecrawl Scrape: x402-paid web page scraping for AI agents. Pay 0.015 USDC per URL to get the page rendered with JavaScript and converted to clean markdown (optionally raw HTML, links, summary). Use when a plain fetch returns empty, JS-only or 403 content.

Munition Firecrawl Search: x402-paid web search for AI agents. Pay 0.03 USDC per query to get up to 20 web results (url, title, description) and optionally the full markdown content of each result in the same call.

Munition Google Images: x402-paid Google Images results for AI agents via Serper. Pay 0.004 USDC per query for image URLs, thumbnails, dimensions and source pages.

Munition Google News: x402-paid Google News results for AI agents via Serper. Pay 0.004 USDC per query for recent articles (title, link, source, date, snippet) with country, language and time filters.

Munition Google Search: x402-paid Google web search results for AI agents via Serper. Pay 0.004 USDC per query for organic results (title, link, snippet, position), answer box, knowledge graph, people-also-ask and related searches. Country and language selectable.

Munition Google Shopping: x402-paid Google Shopping results for AI agents via Serper. Pay 0.004 USDC per query for products with price, seller, rating and link — useful for price comparison and product research.

Murano Glassblowing — Craft narrative for understanding transformation processes and skilled iteration.

Musashi Five Rings — Strategic text by legendary swordsman for tactical thinking and competitive frameworks.

Call when you want the current Musebook money-challenge leaderboard, trending lobby posts, and newest Playbook skills in one payload. $0.01 USDC

Mushroom Broth — Warming comfort food for restorative simplicity and grounding.

Music Artist Lookup: discography, genres, origin (MusicBrainz). Music artist lookup from MusicBrainz: type, origin country, active years, genres, full album and EP discography with release dates, and similarly named artists.

MX record lookup for any domain — returns whether mail servers exist and their hostnames sorted by priority. Verify email deliverability before sending. Supports all TLDs including ccTLDs and new gTLDs. No DNS library setup needed. Accepts USDC payments on Base and Solana

Emission-factor lookup: fetch the underlying factor (value, unit, methodology, source, licence) by id, activity_type, BEA code, or spend classification. Audit-grade provenance, no calculation.

Mycelium Market Snapshot — live Mycelium Strategy liquidity allocation plus Solana top-performing tokens, in one JSON call. MYC reward: the first payment from a Solana wallet also sends 1337 MYC to the paying wallet (one reward per wallet).

Geolocate the caller's own IP (derived from request headers); same fields as /lookup/ip.

Curated reading list on N for tutoring agents, quiz generators, and reading apps — 187 public-domain books (e.g. Lives of the Most Eminent Painters Sculptors and Architects, Vol. 01 (of 10) Cimabue to Agnolo Gaddi, A history of art in Chaldæa & Assyria, Vol. 1 (of 2), A History of Art for Beginners and Students: Painting, Sculpture, Architecture). Full-text retrieval with drill-down routes for chapters, quotes, and citations. No license, no API key required.

N9T2 Bridge paid service: base-xrpl-trading/book_offers

Official National Bank of Ukraine (NBU) exchange rates of the hryvnia (UAH) on a date: 40+ currencies, gold, silver and SDR, with English names. Call it when you need the legally official UAH rate for Ukrainian accounting, tax, invoices or customs, or to convert to/from UAH on a given date. Params: date (YYYY-MM-DD, default today in Kyiv), currency (ISO code, optional; omit for all).

Ukraine consumer price inflation for a month: headline and core CPI as % month-on-month, year-on-year, since December and period average, from the national total (State Statistics Service data republished by the NBU). Call it to index UAH amounts, write a macro brief, or compare Ukrainian inflation. Param: month (YYYY-MM; omit for the latest published month).

Results of Ukrainian domestic government bond (OVDP) primary auctions held by the Ministry of Finance, as published by the NBU: ISIN, maturity, cut-off and average yield, bid-to-cover, volumes and funds raised. Call it for UAH yield-curve points, sovereign debt monitoring or fixed-income briefs. Param: date (YYYY-MM-DD auction date; omit for the latest auction).

Daily official NBU exchange-rate series of one currency against the hryvnia (UAH) for a period of up to 366 days, plus min, max and % change. Call it to chart or analyse UAH moves, compute averages for Ukrainian reporting, or check a rate across several dates in one paid call. Params: currency (default USD), from and to (YYYY-MM-DD; default the last 31 days).

National Bank of Ukraine key policy rate (облікова ставка) on a date, with the overnight deposit and overnight loan rates and every policy-rate change in the previous ~13 months. Call it for Ukrainian loan or deposit maths, late-payment penalties tied to the NBU rate, macro briefs, or to see when the rate last moved. Param: date (YYYY-MM-DD, default today in Kyiv).

Collection search by name — top ~10 matching contracts with links into every other endpoint; ALWAYS live

Realtime holds-or-not ownership check (token-gating) — ALWAYS live

Wallet scam exposure: verdict + per-holding evidence (spam flags, copymint collisions) — cached ≤24h

Deterministic scam checklist with verdict + evidence (spam flags, copymint collision, concentration) — cached ≤24h

Wallet NFT portfolio (first 100 items + honest truncation, spam flags, rollup) — cached ≤24h

Applies ordered set/remove attribute and set name/description operations to caller-supplied metadata, then hashes canonical output. It does not mint, sign, upload, mutate an on-chain token, preserve media, or verify ownership.

Resolve one NFT (contract + tokenId) into normalized metadata: name, description, image, attributes and token standard (ERC-721 or ERC-1155). Reads the on-chain tokenURI/uri, then fetches and normalizes the metadata document (ipfs/ar/http/data), rewriting ipfs image links to a gateway URL. Returns `found:false` for non-NFT contracts. Live reads with automatic endpoint fallback.

Who owns a given ERC721 token id, plus its tokenURI and collection name in the same call. Answers is this NFT still theirs without an indexer or an API key. Via eth_call (ownerOf).

Cheapest entry point: one-call COT snapshot. Report dates, top 3 crowded-long and crowded-short markets by 52-week COT index, biggest week-over-week spec move, universe counts. From the same 438-market CFTC dataset as the premium endpoints.

Evaluate a claim or question against one supplied HTML or PDF source and return anchored evidence.

Does this New Orleans address hold an active short-term rental license? Query any street address and get license number, type, subtype, expiration, and operator/holder fields from city open data. For host compliance and agent workflows. Input: address string. Output: JSON, live City of New Orleans open data.

NVIDIA Gross profit history: Company: NVIDIA (NVDA). Return recent reported gross-profit facts from SEC filings. Focus: investor research. Uses live SEC EDGAR filings.